Why? Imagine you found a nice old node with Super Search. Then you click on the "Linked by" link (I suggest the same behavior as the readmore tag) and you get a list of newer threads. If you are lucky, then these threads cover newer Perl versions or recent CPAN uploads. In general it is a nice way to find related nodes.
Second, it would be easy to implement a "Most linked nodes" list. This way, we all would have a common place for all the classic nodes (What was the id of the "Homework" node? Or the "How (not) to ask a question?" one) instead of scratchpad lists.
In reply to Proposal: A "Cited/Linked by" list by lima1
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